Abstract: A locking apparatus for a door comprises a key which is engageable with a lock from a first side of the door to enable the door to be unlocked The key, which is preferably a card, is subsequently only removable from its engagement with the lock at a second side of the door remote from the first side. The key is only removable, once engaged in the lock, when the door is again locked, or removal of the key may itself cause locking of the door.

Abstract: A door closer comprises an actuator assembly (20) adapted for fitting within the thickness of a door and an anchor member (10) adapted for fitting in a door frame in opposed relation to said edge face of the door. An operating member (30) is driven by spring means (45) and coupled to said anchor member (10) to draw the door towards the door frame. An adjustable fluid-filled damper (50) is coupled to said operating member (30) and arranged to provide variable regulation the rate of movement of the operating member under the force of said spring means (45). Resilient thrust means (85) are arranged to exert an increased driving force of said operating member (30) and adjustable control means (100) are provided whereby said thrust means (85) is operative to augment the driving force to said operating member (30) over a defined but variable part of said range of movement corresponding to movement of the door over the final part of its movement into its closed position.